Hypodermic needle



lFeb. 5, 1963 s. l. coPEN 3,076,457

' HYPODEEMIC NEEDLE *Filed Feb. 14, 1961 INVENTOR.

S. IRVING COPEN @MZ/WW ATTORNEYS 3,076,457. Patented Fei). 5, i953 ice 3,076,457 HYPGDERMEC NEEDLE Simon Irving Corien, 1'78 Bay State Road, Boston, Mass. Filed Feb. ld, 1961, Ser. No. 59,243 3 Claims. (Cl. 12S-221) designed for subcutaneous dispersion of fluids.

Conventional hypodermic needles often cause discomfort and pain to the patient in the area of injection due to the slow rate of injected fluid absorption by the surrounding tissues. When the injected fluids are relatively viscous, this pain can last for a substantial period of time and often cause an undersurface distension commonly referred to as a wheel Further, conventional hypodermic needles are often unsuited for specifically localizing an injection. Thus, for example, when it is desirabl in dentistry to obtain a block anesthesia conventional hypodermic needles are not completely satisfactory. In injecting fluid in such cases, the solution must be emitted from the needle point directly over nerve section in order for it to be effective. Such exact placement of the needle tip is often diiiicult. The present invention, however, provides a hypodermic needle which overcomes such problems by providing means by which broader dispersion of fluids and more rapid absorption of such iiuids by the body tissues may take place.

In the present invention there is provided a hypodermic needle having an elongated slo-t extending longitudinally in the needle wall. Fluid passing through the needle into the body tissue will disperse along the length of the slot. The length of the slot determines the degree of absorption and distribution possible. Because fluids may be dispersed over a greater area of tissue, absorption by the tissue is more rapid. This in turn results in less discomfort to the patient than is usually experienced with conventional style hypodermic needles.

The construction of the present invention also permits a more rapid withdrawal of the needle. Conventionally, needles are often injected to their full length and then slowly withdrawn as fluid is being forced from the tip of the needle. This is quite often the procedure followed when injecting local anesthetics to obtain a more widespread anesthetic effect. The need for such operation and its requisite skill is eliminated with the present invention where a broad dispersion may be obtained without the necessity of carefully dispersing the fluid as the needle is withdrawn from the body tissue. Other similar advantages may be obtained in using such needles in general and minor surgery as well as dentistry and oral surgery.

A further object of the present invention is to provide a needle having a channel which is useful in the aspira tion of air and fluids from body cavities. Such needle establishes a more direct drainage because of the elongated opening in the needle than conventional style needles.

These and other objects and advantages of the present invention will be more clearly understood when considered in conjunction with the accompanying drawings in which:

FIG. 1 is a plan view of a hypodermic needle useful for subcutaneous dispersion of liuids;

FIG. 2 is a cross section of the embodiment shown in FIG. 1 and taken along the line 2-2 of FIG. 1;

FlG. 3 is a plan view showing a preferred embodiment of the present invention;

FIG. 4 is a cross sectional view taken along the line 4"-4 of FIG. 3;

FIG. 5 is a plan elevation of a double channeled needle; and

vnoozle of a hypoderrnic syringe.

FIG. 6 is a schematic illustration of dispersion effects of fluids injected by needles of the type herein described. Referring lirst to the preferred form of the invention as illustrated in FIGS. 3 and 4, there is shown a hypoder-mic needle 1 formed preferably of an elongated tubular steel member and opened at either end. The needle The present invention relates to a hypodermic needle is preferably circular in cross section as illustrated in FlG. 4 and is formed with outer wall 2 and inner wall 3. The needle extends from a pointed tip 4 at one open end to the bore of a hub 5 at its other end. The hub is of conventional design and is adapted to frictionally iit over the A slot 7 is formed in the needle l with the slot extending from the pointed tip 4 rearwardly and preferably over a distance which comprises a substantial major fraction of the length of the needle l. The width of the slot should be substantially no more than The length of the slot may vary depending upon the particular diameter of the needle l and a purpose for which the needle has been designed. Thus a 2" needle might be provided with a slot 1/2" long. For purposes of thi-s invention, however, the slot should be at least 1/e the length of the needle apart from the length of the hub.

In the embodiment illustrated in FIG. l the needle l secured to the hub 5 and having a pointed end l2 is also formed with a slot 13. The slot 13 extends longitudinally of and through the wall of the needle l. Preferably the slot should have a width no greater than 180. This slot i3 is spaced from either end l2 or l5 of the needle, but preferably extends quite closely toward the needle end l2.

A further modification of the present invention is illustrated in FlG. 5, wherein there is illustrated a needle particularly useful for a hypodermic syringe and needle arrangement as illustrated in my US. Patent 2,687,728,

issued August 3l, 1954. in this arrangement there is pro-v vided and elongated tubular needle 2t? having a bead or other enlargement 2l intermediate its ends with the bead 2l rigidly secured to the outer Wall of the needle. This bead serves to engage the end of the nozzle and prevents the needle from slipping into the interior of the syringe. A cap is threaded over the syringe nozzle and against the bead 21 to hold it rigidly in place. Elongated slots 24 and 25 are formed respectively at the ends 26 and 27 of the needle. These slots extend up to a major fraction of the length of the needle 20. Preferably, however, these slots 24 and 25 have an arcuate width of less than substantially 180.

In FIG. 6 there is illustrated the effect of injecting lluids into an absorbent body. A very localized dispersion such as illustrated at il is obtained by conventional needles while the dispersion obtained when iluid is injected by a needle made in accordance with the present invention is illustrated at d2.

What is claimed is:

1. A hypodermic needle for subcutaneous dispersion of liuids comprising a hub adapted to be secured to the nozzle of a hypodermic syringe, a tubular needle open at its pointed end and connected at its other end to said hub, means forming an elongated slot extending longitudinally of and through the Wall of said needle with said slot having an arcuate width no greater than substantially 186, said slot intersecting the opening in the pointed end of the needle.

2. A hypodermic needle for subcutaneous dispersion of fluids comprising a hub adapted to be secured to the nozzle of a hyp-oderrnic syringe, a tubular needle open at its pointed end and connected at its other end to said hub, and means forming an elongated slot extending longitudinally of and through the wall of said needle with said slot spaced longitudinally from said other end, said slot having an arcuate width no greater than substantially n 3 4 180, said slot intersecting the opening in the pointed said slots having an arcuate width of substantially no end of the needle. more than 180, and each slot intersecting the opening 3. A hypodermic needle for subcutaneous dispersion in one pointed end ofthe needle.

of fluids comprising a tubular needle pointed at either end and adapted to project through the nozzle of a hypodermic 5 Refeens cned m the me of this patent syringe, an enlarged member integral with said needle UNITED STATES PATENTS and intermediate said ends adapted to engage said nozzle 2,637,723 Copen Aug 3,1J 1954 for positioning said needle, and means forming elongated slots on either side of said member with said slots extend-f FOREIGN PATENLS ing longitudinally of and through the wall of said needle, 10 1,142,769 France Apr. 1, 1957 

1. A HYPODERMIC NEEDLE FOR SUBCUTANEOUS DISPERSION OF FLUIDS COMPRISING A HUB ADAPTED TO BE SECURED TO THE NOZZLE OF A HYPODERMIC SYRINGE, A TUBULAR NEEDLE OPEN AT ITS POINTED END AND CONNECTED AT ITS OTHER END TO SAID HUB, MEANS FORMING AN ELONGATED SLOT EXTENDING LONGITUDINALLY OF AND THROUGH THE WALL OF SAID NEEDLE WITH SAID SLOT HAVING AN ARCUATE WIDTH NO GREATER THAN SUBSTANTIALLY 180*, SAID SLOT INTERSECTING THE OPENING IN THE POINTED END OF THE NEEDLE. 